package com.itheima.Jiuye05;

public class TestSystem {
    public static void main(String[] args) {
        long a = System.currentTimeMillis();
        for (int i = 0; i <10000 ; i++) {
            System.out.println(i);
        }
        long b = System.currentTimeMillis();
        System.out.println(b-a);

        int [] arr = new int[]{1,2,3,4,5};
        int [] arr1 = new int[5];
        System.arraycopy(arr,0,arr1,0,arr.length);
        System.arraycopy(arr,2,arr,0,3);
    }
    
}
